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  <title>ol-ext: Layerswitcher image</title>
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  <meta name="description" content="An OL3 layerswitcher image." />
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  <a href="https://github.com/Viglino/ol-ext" class="icss-github-corner"><i></i></a>

  <a href="../../index.html">
    <h1>ol-ext: Layerswitcher image</h1>
  </a>
  <div class="info">
    A simple layer switcher control with image buttons to select the layers.
    <ul>
    <li>
    The <i>title</i> or <i>name</i> layer's property is used to named the ol.layer in the switcher.
    </li>
    <li>
    <i>displayInLayerSwitcher</i> layer's property to cause layer to not display in the LayerSwitcher
    </li>
    <li>
    The <i>baseLayer</i> layer's property manage exclusive visibility on layers (only one base layer is shown at a time).
    </li>
    </ul>
    It use the <a href="../layer/map.preview.html">layer.getPreview function</a>.
  </div>

  <!-- Map div -->
  <div id="map" style="width:600px; height:400px;"></div>
  
<script type="text/javascript">

// Two base layers
var layer = new ol.layer.Geoportail({
  baseLayer: true,
  layer: 'ORTHOIMAGERY.ORTHOPHOTOS'
});
var osm = new ol.layer.Tile({
  title: "OSM",
  baseLayer: true,
  source: new ol.source.OSM(),
  visible: false
});

// GeoJSON layer with a preview attribute
var vectorSource = new ol.source.Vector({
  url: '../data/fond_guerre.geojson',
  projection: 'EPSG:3857',
  format: new ol.format.GeoJSON(),
  attributions: [ "&copy; <a href='https://data.culture.gouv.fr/explore/dataset/fonds-de-la-guerre-14-18-extrait-de-la-base-memoire'>data.culture.gouv.fr</a>" ],
  logo:"https://www.data.gouv.fr/s/avatars/37/e56718abd4465985ddde68b33be1ef.jpg" 
});

var vector = new ol.layer.Vector({
  name: '1914-18',
  preview: '//wsrv.nl/?url=http://www.culture.gouv.fr/Wave/image/memoire/2445/sap40_z0004141_v.jpg',
  source: vectorSource
});


// The map
var map = new ol.Map({
  target: 'map',
  view: new ol.View({
    zoom: 6,
    center: [173664, 6166327]
  }),
  layers: [layer, osm, vector]
});

// Add a new Layerswitcher to the map
map.addControl (new ol.control.LayerSwitcherImage());


// Redraw layer when fonts are loaded
$(window).on("load", function(){ console.log("loaded"); vector.changed(); });

</script>
  
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